The below pictures are grouped by Kinnikuman Part. You'll see that there is indeed a pattern!
Keep in mind that the MCIA is not complete, and that there may be other MUSCLEs only missing a sculpt of one particular color. (This kind of makes me wish the MCIA was arranged by Kinnikuman parts.)
In light of Arforbes recent find of Kinnikuman/MUSCLE being molded in groups within parts coupled with the below pattern, I think it is clear that the MUSCLE color mystery is connected to Kinnikuman parts.
In other words, the colors that a particular MUSCLE was or was not produced in is directly linked to which Kinnikuman part it orginally belonged to.
This means two cool things:
1) MUSCLE were definitely made using the same molds (or molds based off of) Kinnikuman molds.
2) It will eventually be possible to determine which MUSCLEs were made in which colors DEFINITIVELY.
Part One
Part 1 | Missing Dark Blue
Part 1 | Missing Dark Blue
Part 1 | Missing Dark BluePart Eight
Part 8 | Missing Magenta (Comes in Grape)
Part 8 | Missing Magenta
Part 8 | Missing Magenta (Comes in Grape)
Part 8 | Missing Magenta (Comes in Grape)
Part 8 | Missing Magenta (Comes in Grape)
Part 8 | Missing Magenta
Part 8 | Missing Magenta (Comes in Grape)Part Nine
Part 9 | Missing Green
Part 9 | Missing GreenPart Fourteen
Part 14 | Missing Purple

















